Berlin 2008 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 14: Statistical physics II (general)

DY 14.6: Vortrag

Dienstag, 26. Februar 2008, 15:30–15:45, MA 004

Free energy barriers of spin glasses — Andreas Nußbaumer, •Elmar Bittner, and Wolfhard Janke — Institut für Theoretische Physik, Universität Leipzig, Postfach 100 920, 04009 Leipzig, Germany

The Ising spin glass in the Sherrington-Kirkpatrick (SK) mean-field and the Edwards-Anderson (EA) nearest-neighbour formulations are investigated by means of Monte Carlo simulations. To this end, we employ a combination of the multioverlap algorithm with the parallel tempering method. We investigate the finite-size scaling behaviour of the free-energy barriers which are visible in the probability density of the Parisi overlap parameter. Assuming that the mean barrier height diverges with the number of spins N as N^α, our data for the SK model show good agreement with the theoretical value α = 1/3. We compare the scaling behaviour to the data from the EA model.